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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73a62ee49d81a908b189f5bbe027b33ce56da7c2fa6492449f786c68392f7fa' 
  AND token = '4ijZIYDfmWUNV4uXAk0pfkg9r0d4oj1pviiyQjB/D6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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