SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac3776d0076327d27b3828f5594c110c11110540759d28be4b2637abf754827' 
  AND token = 'KEouTMIs6ZU77zEF3SurdYmKEvZqfQoJCXwUlr+I6W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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