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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e541d29131ca89472cca3cc1bcc9dffed1010879d2f1ab75c36c17e995be9fad' 
  AND token = '3UJlNgcMNLKRAEanjvCl5b2S/HhkFdX+gFN/DwIavpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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