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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be54c032379130397d764a6dc71b778a7c8ab86715a707ae6f01b71940f8144a' 
  AND token = 'desXzQf9TEkFCzorVAXOEwkQ2Tvc+m3pDs1NsrWb73w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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