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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bee5745d8f44b6f6eb6c6d9895a32f2f9e5c2ecafaa95b4d24e33eb8bc88716' 
  AND token = 'cGiZj+PYiOX+1AH3Qn51kQmCeDFlZd9GtQPjDUySHVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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