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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b15d9457b8520121c4c8f3b5080e6399d9e5c43e86f5e41601bafc6148e695' 
  AND token = '8IWZxSVUwJN+hSYhnGb/pqw7/3Jkbi9H5KkfcAWTw6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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