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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c775bedfec9753575573df4505a74c206f3289bbc0d60eb2d00a49e2bace6b0f' 
  AND token = 'Wa3RJmJNGZ+NQ84yQ95p0C1vktTx6b0blwPYGyggkgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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