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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e72a36b0916e117d41779c5d825339bf1009cc6e58d62bc46ee58ba9db901c6f' 
  AND token = 'Sd20OIfjGoZ/f9GUlR4xbnxLM/2T9x5ySPWd7wso+uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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