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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08cbf97db440d577cf4ae2e41f5ecfc2b196e12b7a2ba51d177d5f1205a92c5' 
  AND token = 'RKFNc98l+zczP5/kXOe8pv87SIOwyzcI7InyyJ8NbDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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