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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15717b6bb7232b245d5ac15ad985e28d0f8b14660d2c4a65886b713f68f418b7' 
  AND token = '1mtXcfiJ8x0rtsTT23n0GBsavKolS7e4f2t3SKRrFr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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