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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f7e65c2de7959fe6cc23ad5e5f8310239b6ea2a822593761d2b7e2a6f055be' 
  AND token = 'x6DPNyHlRASybdBcT51GpL9io5xgSnR6M+fO/5IeF3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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