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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be3348773373162b7faf97b2a3206e2557f874709c899f830ee0d7a02c53866a' 
  AND token = 'rQAu8+UPDkkTzKfEcHuJ8eOEih8AnrG7luIMhORAzl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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