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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e8ccde9a394f8d4e871e152129d5a39dc8117ad9338713cea9ac5bd23ed115' 
  AND token = 'twjLze/VKk+3ypH0oUMZ2flDsHw5z1UlQYTTfZZL7yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}