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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b715e68eb836a201bc05c27d215bd5d7ff877e81fb1ff3776434964f4d3484aa' 
  AND token = 'Lis/0/Fh9KnmK383FaXvs2XErqtf42a7mvp8jqnpyFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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