SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a902fb030388f68b3c822103789a572a941c8f35f1ce2351c615d9f14b4854' 
  AND token = 'oxdorHnoELYKOwIflnghRVvgG2FUpY+JTlZ+jNwkI04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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