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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f097ccff4132bfe0db2666edd1a9790f126d1715581caea0b96d3cb98b14272' 
  AND token = 'vRqt2pTKgq8kbC6WH6hUbx6RxwDEu6Z1I9f40IW8S5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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