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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a5ad50345e4a8c8b652eb7933e3d24fb05e1ece9eafcb8d9bc3a23ffe52700' 
  AND token = 'qbLTGMdDoIoMM3qaZo+cPOMUgkZSZxEylT0XRm1qf3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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