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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb47c8e32d047e2c14f868fb27da9feb0caa4636104fda2caffe63dffd211f1' 
  AND token = 'xFKar5jSLS/1ZbNQl/xg8VvDC1+TYCs551s2sYMEu2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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