SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02791792b5dc629cfd3c1dea7d443b2412fb42c0ae60cbf3aedc8e958e825b38' 
  AND token = 'VgMz/37nZozEsl1/2si6zKsGne0jHq3M+lkhbOAFmAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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