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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860be4a140b95eab450470506bdf0fc53393bd582ecbadea913117b993d1cf99' 
  AND token = 'HNOOvHW9norgX766RHcG11lf+TjrNYFqABHJzCcc/dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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