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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a81f3bbd827e7d3e26b51729eb6b480f4369a02d26661340818ba29c10a7cbb6' 
  AND token = 'gKlg9E/mvfjnXrxS6IS4wJQxXuCze6IdkH7LASRjMO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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