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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029fb1a23228cc9c2d15140cb21fc158b077d71c12b7472ef650ab63f4e2e294' 
  AND token = 'WF0CJHRwfvU9YTMUL1E0CLKvDga0OZweJ/5KgrNUFGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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