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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5f562f4ed3e9d83d6197bdda903b2b6550081cf12ed03073253f86d3588c78' 
  AND token = 'npFUc/wveP8aRGZF88QNOM8Cv1KgD2KeEV5jaU/pt4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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