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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff2846a807e9ec1612a61a947ab79657729ac63c5a6a28f45a607a0fa04e121' 
  AND token = 'uwIHvbVZVwJmqeRCS1axv0Uje7NoGyOJOdPtWKliTUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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