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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df91c3ed5c8454242bce84bdd301b72069ba0ac8d23603100e3bf16cd7a88ede' 
  AND token = 'pfyvq4UC8fEws+nOmL+79WlNCs4S756SxdRWdEY9+OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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