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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e0c54c33dc7b60de24c2dc66c2a03a5137d2dead9827709ce17b3c73775488' 
  AND token = '8RwlYxZCEYOAXcbM7gwgR92h23raULaKH9DXqoPl+Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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