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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d89e97650c90779f7a24495b216f02d7bbfdab76248760af346b0ba95491357' 
  AND token = 'Ohq8Hr6NHKDqGeD+jjVQIE6DQS1Op6T0XyJS3pnzR8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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