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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae2e58eb74784ce5131547f93eb78d9aed7635780493a852ee8ca669c81a558' 
  AND token = '4y6dhC0EFI+08/Rsb8xyAfKmcsH8Hs9FmKKPRFZLXw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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