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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41877c93a9b27a74e527f3fec01ef5f299325d3657dc96a5ae349285c346cf88' 
  AND token = 'YrcApzTpFCaJYvTPYRz0mS5+UVlrN48lWv2lqToQlic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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