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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ee3270eaf09efc0488c5ba25df1ee2e38a2c5ba23c221828d6d4cd83282588' 
  AND token = 'Ukoy1MpLaWgECAxkQPDQtp/NRrVBEnQHSJXyX8t9fVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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