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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c82830456448b1dfd08159897a8011648af07ecef92d1a912242e5ec5941f3cd' 
  AND token = 'ONVh7Pi+tEJBOZcGRZyOwlGOf1r6elGiCfbzuRYdI+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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