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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e2e691fd6b078bd085946c60de38af0f49e497bbef86fb64b47a2e957e973b' 
  AND token = 'i+Rc0ZJbse7tG40qIM8ELpm5YsFyOi5OedgXwl30jDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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