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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32eb55bcd069fb69366a705dc4e9fa004919ac3ea347012aaf0c29467123d8be' 
  AND token = 'iK8YOfeRzlP7Eqnu8XKVsE6+nnfLuWp+hqMVztE1IuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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