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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '170c0b438c4742f58498ac84cbf7fa8a82b7b02e72ddca93ebca630a4473fae0' 
  AND token = 'gWCWfX+1/tPZWtFaIieWsoaogvJ8kaOZYEBK6v+Y1Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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