Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d271bfd5ffce075d208da60aca17a0dba480160ab6a48db88df76bc4978ba6' 
  AND token = 'v+XELf612Hrb2iYCzgTdPravAAwGPBR16T9cxoYqctw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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