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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8acf13c4f4edc2edb0d1ccce6dcf05df2e8f7b78f8028ef209aa5e19cefa98a0' 
  AND token = 'oLSQWsvjkswAw65Fa22vIPpmWycmVYYmPu8yqMnb2Qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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