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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac60545050dc8a6f940df5001d6ef9341eed5207ea641d1e44862901a4fb82f' 
  AND token = '9108ZB4AaB6qIJni9G1q8JL4Tix1UdEGp//Lu3YBxv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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