SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '195b8dfa8e39b433e5807daf3f13f9563c6ca5613a171360025c400b650fa0db' 
  AND token = '/oH7pGLB+7lk+P4Y5mtF2cuFDAS9+nz9LKXvo5HVKM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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