SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9368b30cf4d9abdeb281b8c9e4f184618fe0fd7b0a135ab461bc835d6e8203df' 
  AND token = 'RPfvNlmtGjVLfpv/xOUHKqFBYyF59ZKA2y4NknWSqIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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