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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f68d733e35b8f842f9125acb8f3159ea0815186597ab8bd32a400cb09e6c1e4' 
  AND token = 'K4FY8Wf7D6WAL/3g9aAQQ9KWld7drUteLr9ENCpLhPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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