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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd33a0067bc0d10874920e6d829ad981670af12acd098596606881b24c694c368' 
  AND token = 'kY2Ai8yO665f6XxE7hvEkPY9CXPQntqWGg6N0IFqhrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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