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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229b7ddc422db771e096c64bcba51982c91b9a526c760de38a14b6725fb1090a' 
  AND token = 'CgZfMtFbqm04Exu+rH9/EBa1wuqg5cLcgh69KYVN7P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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