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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2daa6ba467b61bd8a5a6de2faa2c3cced09662a067148643c60fec26f79bff68' 
  AND token = 'XbOxPVNqFFhFOowEJheFIcqDXFC5VogCeHtqE9kU5Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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