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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ee6f29b30b5e8f174a5e1b95a24df0f8ef4d14b7fd8570fd83670d13f468f5' 
  AND token = '7fxGXQvLMw33bMfddOg5xiki3XKGiX0FLl5hsgJagUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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