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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1020ac1d188ff36a776bcbad0374bbd936a1471ba20f52c4f2a8801fa8729a33' 
  AND token = 'fsru55JeEw+ki8rxhi07fIo16ZX8+uOMfh2bzV2nSxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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