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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b28ed3909099e724503fbd1e7b26c1a85a6417a5225fef25778c38e2658ba77' 
  AND token = 'Vtbs5R3hlwQr6cEp/wQPvY2Nxld4qwaDABqMV2EVRrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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