SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd909e3c54a3da996cdacd00535260386f14ce20cde6b177138ce667f398694bb' 
  AND token = 'gXB5EwAEn/bxWTjNlKmYafSHtJfVgS8dBjG4NDnmW+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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