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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc3c61ae5ba57fcb6109e6cd68a904565e0be47b8785b1ad67f4db4cecf26f8' 
  AND token = 'MFJFdxjiJGI9mOALvkI4u78q8OMh9X+WgaJzbN+gyD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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