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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d6735270964e856ccbb4ab7eebd1d2a57e9c3c549ff877a168011a356795d9' 
  AND token = 'qh/YfGGee8kyxkDPSvQl/c2j96Hprc6laAjcAtKlaj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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