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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ca355ec52fbfc84d021693328c1de58f2fbddac583b814a938e5ff20482c5f' 
  AND token = '2ikhdnc5PpI6j6KW/LAsoQxoRQvdEecUBdiB2JOvcxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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