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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5564d642e8c0be97f4768863c683698d164a1bd59783b1563b5cb8dc10bd9057' 
  AND token = '/WxkDckPn4liLBK596jw4+v4BOY3104uUsJiMZkm/F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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