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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620a961056ab311dae450ab050c39f9efd5830a5496bb8f08bb22a055d7e22cb' 
  AND token = 'NvBVaf6TZHA42fr64iqZ+lbBU/Wr7P+Zsqnxy2RYqzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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