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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e243c946c45880be2e68466320d47dcbf310318ab71c90a17a3cfce360a7e9' 
  AND token = '+Rojw916xFEzGzgg8BMncD9CwqdpokeyR94AES3iV2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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