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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c32c58b9eb621f1cff2c29e78482b67abc06ac653857a126eeba36918cfe00' 
  AND token = 'gmJwhxaZQL8Om7ogSkn8rINLXDZaUDgVc272R6hMg8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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