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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9f7a29a162f0503c1816432b4f48a6b9d6b04ab005a8efc0029cff934884148' 
  AND token = '/QRN6bvvcBKeyIfay7TDU5k3kK1RGzj4asBnnDx1LrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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