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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af13e4c15a6e0ac1c77d7223d29fb23458509dd740769fd11117d51413c8fd5e' 
  AND token = 'pwiQphSIzRaqSgFIuiu/zLScxvqTs2jTQ9cuk03KRnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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