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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '111f0c080c2501e482faa9b3538b0eaa52801f88dd64b5a7597c47190914ed20' 
  AND token = 'WfByzAeGjU5Qg04bMb5gK87v1Wos1GtavDIyyilUl4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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