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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c27e2f9fd81601b5d2c60eb4dda4bac2568c62b1f0543b5d546df9ec712c4373' 
  AND token = '3fArTu36NPuJy1s+V1eC5s6h8FDtJCEiBc/riYA2eFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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