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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2874649312f69078e5d52e9b9d58fb8ac5674c37462da281caf65a6f2f8edc2a' 
  AND token = '77JxkOAnl6zK5AR1dRbOEi/WAZ6YLbOK0A7XEvVQalU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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