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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e40e3d3184fddd4f46d24437a19066ea6b45096af410058059d20d13a8567d8' 
  AND token = 'nzcxOd3H+KUcJy6asD8Ti6oZelnn5WjKDIyV+gUnLis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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