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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002dd7e4a783380d13740a83074a232919de9be5582b6b41481e197ab1db1f59' 
  AND token = '9wp5bvXaWbEusYnqniNYfhmrEvrXmnnSoXLvmgzwKik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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