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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a374a717ea2e2f1872be697b4df9cadf897fc34e10fdecccd2df0334366b25' 
  AND token = '1HlxRc0s69KLjPhOqRc9pEGIWr+4xPt9m4N6EYzQFD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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