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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78e98143cb5082b9acb31f325bd0103ab16eca56befdfaaa92965b8fc9fcf033' 
  AND token = 'qG1qmXZe5f5DCZ4wLALxZizEIxvMSEB2Dml3bORqCrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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