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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb674359e113cfafc17986aaefd6e3ba67abe5ffa0b5f7dd2a7d55bc6ec24c3' 
  AND token = 'UZhG5DX6qR0GfpvYN/+K0liFJvZicN0inrHii8IjR6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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