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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a3ffe59621302ae3bcaf0dc289bb4b05713b6c1a9eacd5c98237dc4def9778' 
  AND token = 'A8OO2vUUK2/O6w+lxIhMBe7d1Bx2gZE5tPk+J2cUDQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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