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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f85f700dca9772d36581011d1e3e5f69871dc030a2b39f18279dbe44764b566' 
  AND token = 'VEF/NS02/Tlz/qCGfx6DlNI70ujuZemPu4ncVGmuOMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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