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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f30b08f2d53c9f450fd9501f8a5494a21e6e78490cf19c113cb86e48cd78ae' 
  AND token = 'v9erhNriUk8QQDGseN6vrkidvd7282KNFCczoqGA1PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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