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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c415853544b019d7230ffb233c188ab6efb553e3fb8fea0d072693e1485f1db' 
  AND token = 'qZsYQjkydWzUF4lWcF42+14MExAWPm5Dw7TdQA1Eja8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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