SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1177d57f94d9469b897eefaf2daef81940f6d0541f524f8ff18886b514e7fe' 
  AND token = 'FZI2DHOlgxipmPGMIYrVK0lm/kShe3JdvIGSXzchp9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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