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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79e775ddba609bee92908c80e4395e4377a838719b902e4d2ad8bbd66e159412' 
  AND token = 'NrWqMLamgGzBii5BrMdiIZYYto9wgjcvuZHRWUq/eFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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