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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ce05a61ff92e6ac6ddd407b535ffc11e030dcce372af86674b126f1d02ad38e' 
  AND token = 'Vh/4BV5/I0WhwloyNKmQ00Oze5aSSnOUlwP6XsfETEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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