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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '142bb548aa1669aa7b0aa291b93f394999b6943814475a949d66b48ee95d9303' 
  AND token = 'DM8IFvlylYc/+exdYWLwmGg7YjwIeGMTKcxETszUGIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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