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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd54d5223debeb3da5b5423de27fe9284e6b3df3d9d5de12434d618c55bfef944' 
  AND token = 'YEvHu4meleHdrsJ9pD4VpKPg/7/QLOOA8opt4xEAitM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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