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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e66d83d05d02d12ede174d296512714965108cf2db78cafc8d7cd60b3aeb40ee' 
  AND token = 'sXnZeCsqV7T6uNfeEyUZhNc7TnvHRFu5X6frRgT0loA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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