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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3eef35e27724016012c262d962bb30f7b9d9728d08c8d201443d05fe3647a90' 
  AND token = 'Z0ltbPSSJ0LYF61wH3V4FuJfCPurvVKqo84Ey4JEVlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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