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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b43da38308b0fd661e8f6dd520ecc2412651684326e70be819c231f16ae3d52' 
  AND token = '9x/9lkgpILgX7hteMQzoRx0TxMQVmGLJTqOm2JkcJ/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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